岩藻聚糖能降低尼罗罗非鱼柱状病的死亡率吗

Hebatallah A. Mahgoub
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引用次数: 3

摘要

柱状体病是一种严重危害温水鱼类的疾病。它是由一种革兰氏阴性菌——柱状黄杆菌引起的。本文研究了岩藻聚糖对尼罗罗非鱼柱状菌病的防治效果。因此,对受柱状黄杆菌自然感染的尼罗罗非鱼,用岩藻糖聚糖(8 gm/kg日粮)处理17天,鱼鳍被侵蚀,体表僵硬,体表溃烂。柱状黄杆菌通过选择培养基(琼脂细胞噬菌)从骨骼肌、尾鳍和鳃中分离得到证实,呈典型的根状。利用柱状黄杆菌16S核糖体DNA的选择性引物,进行了柱状黄杆菌特异性PCR检测。岩藻聚糖可使鱼的死亡率降至零,并能治愈鱼鳍侵蚀、体表溃烂和体型僵硬。岩藻聚糖也降低了组织损伤评分,达到正常的组织学评分。
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Can Fucoidan Decrease the Mortalities Caused by Columnaris Disease in Nile Tilapia
Columnaris disease is a serious disease in warm water fish. It is caused by Flavobacterium columnare, a Gram-negative bacterium. In this work, fucoidan was tested for its efficacy in decreasing the mortalities caused by Columnaris disease in Nile tilapia. Consequently, naturally-infected Nile tilapia with Flavobacterium columnare, showing eroded fins, rigid body figure, and ulcerated body surface, was treated with fucoidan (8 gm/kg ration) for 17 days. Flavobacterium columnare infection was confirmed by isolation on selective medium (cytophaga agar), from the skeletal muscle, tails fins, and gills, giving the typical rhizoid shape. It was also confirmed by Flavobacterium columnare specific PCR using selective primers for Flavobacterium columnare 16S ribosomal DNA. Fucoidan caused decreased the mortalities to nil and cured the eroded fins, the ulcerated body surface, and the rigid body figure. Fucoidan also decreased the tissue damage score to reach the normal histological score.
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